<html maa=a>

<head>
    <style>
        body div #myid {
            width: 100px;
            background-color: aquamarine;
        }

        body div img {
            width: 30px;
            background-color: brown;
        }
    </style>
</head>

<body>
    <div>
        <img id="myid" />
        <img />
    </div>
</body>

</html>